ASTM-D349 – Standard Test Methods for Laminated Round Rods Used for Electrical Insulation
Significance and Use
This test method is designed to provide data for the control and specification of materials and for characterization purposes in research and development of new materials. It is possible that the tensile properties will vary with the size of specimens and the speed of testing. Consequently, these factors along with others noted herein must be controlled where precise comparative results are desired.
Scope
These test methods cover the procedures for testing rigid round rods used in electrical insulation. These round rods include many types made from fibrous sheets of basic materials, such as cellulose, glass, or nylon in the form of paper, woven fabrics, or mats, bonded together by natural or synthetic resins, or by adhesives. Such round rods include vulcanized fiber and thermosetting laminates as well as round rods made from cast, molded, or extruded natural or synthetic resins, with or without fillers or reinforcing materials.
The procedures appear in the following sections:
|
|
Section |
|
Compressive strength (axial) |
20 – 25 |
|
Density |
28 – 30 |
|
Dielectric strength |
31 – 39 |
|
Flexural strength |
13 – 19 |
|
Tensile strength |
7 – 12 |
|
Water absorption |
26-27 |
The values stated in inch-pound units are to be regarded as the standard.
Referenced Documents :
ASTM Standards
D149 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies
D570 Test Method for Water Absorption of Plastics
D668 Test Methods of Measuring Dimensions of Rigid Rods and Tubes Used for Electrical Insulation
D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
D1711 Terminology Relating to Electrical Insulation
D6054 Practice for Conditioning Electrical Insulating Materials for Testing
Keywords
Composite Laminates – Composite Rods – Density – Density And Relative Density – Dielectric Strength – Electrical Insulation – Insulating Solids – Insulation Test – Man-Made Fibers – Mechanical Properties – Mechanical Test – Rods And Bars – Thermosetting Round Rod Laminates – Vulcanized Fibers